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Joe Thornber 2dd9c257fb dm thin: support read only external snapshot origins 
Support the use of an external _read only_ device as an origin for a thin
device.

Any read to an unprovisioned area of the thin device will be passed
through to the origin.  Writes trigger allocation of new blocks as
usual.

One possible use case for this would be VM hosts that want to run
guests on thinly-provisioned volumes but have the base image on another
device (possibly shared between many VMs).

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
History 2012-03-28 18:41:28 +01:00
..
accessibility vt:tackle kbd_table 2012-03-08 10:50:35 -08:00
acpi ACPI: remove duplicated lines of merging problems with acpi_processor_start 2012-02-08 16:17:10 -08:00
amba Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm 2012-01-08 13:10:57 -08:00
ata 1) AHCI regression fix. A recent "make driver conform to spec" change 2012-03-22 20:22:30 -07:00
atm eni: fix driver remove function and driver probe error path. 2012-03-16 23:13:20 -07:00
auxdisplay Fix common misspellings 2011-03-31 11:26:23 -03:00
base Things are really quieting down with the regmap API, while we're still 2012-03-22 20:33:14 -07:00
bcma bcma: silence PMU warning for BCM4331 2012-03-07 13:56:37 -05:00
block Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
bluetooth Bluetooth: Adding USB device 13d3:3375 as an Atheros AR3012. 2012-03-08 02:16:24 -03:00
cdrom powerpc: Remove some of the legacy iSeries specific device drivers 2012-03-16 09:28:05 +11:00
char Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-03-22 13:08:22 -07:00
clk clk: add config option HAVE_CLK_PREPARE into Kconfig 2011-12-28 21:35:06 +08:00
clocksource Power management updates for 3.4 2012-03-21 10:15:51 -07:00
connector connector: add comm change event report to proc connector 2011-09-28 13:41:50 -04:00
cpufreq powernow-k6: Really enable auto-loading 2012-02-13 15:26:03 -08:00
cpuidle Merge branch 'perf/urgent' into perf/core 2012-03-05 09:20:08 +01:00
crypto Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-03-22 18:15:32 -07:00
dca drivers/dca: Add export.h for THIS_MODULE to dca-sysfs.c 2011-10-31 19:31:43 -04:00
devfreq PM / devfreq: add relation of recommended frequency. 2012-03-17 21:51:34 +01:00
dio m68k: don't export static inline functions 2009-12-06 11:18:28 +01:00
dma Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-03-20 21:12:50 -07:00
edac edac: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:17 +08:00
eisa eisa/pci_eisa.c: fix BUG introduced by 005bdad7b8 2011-08-04 06:32:51 -10:00
firewire IEEE 1394 (FireWire) subsystem updates post v3.3: 2012-03-22 20:31:15 -07:00
firmware Merge commit '0706802183' into stable/for-linus-fixes-3.3 2012-01-12 11:53:55 -05:00
gpio Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
gpu Merge branch 'drm-nouveau-destage' of git://people.freedesktop.org/~airlied/linux 2012-03-22 13:27:02 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-03-22 20:20:18 -07:00
hv Tools: hv: Support enumeration from all the pools 2012-03-16 13:36:04 -07:00
hwmon hwmon changes for v3.4 2012-03-21 10:37:25 -07:00
hwspinlock Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-08 18:34:16 -08:00
i2c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-03-22 13:08:22 -07:00
ide ide: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:17 +08:00
idle drivers/idle/intel_idle.c: fix confusing code identation 2012-03-21 17:54:54 -07:00
ieee802154 net: remove NETIF_F_NO_CSUM feature bit 2011-11-16 17:43:12 -05:00
infiniband Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-03-22 12:38:04 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-03-22 20:20:18 -07:00
iommu Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-22 09:30:39 -07:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-03-20 21:04:47 -07:00
leds Linux 3.3-rc7 2012-03-14 09:48:16 +01:00
lguest lguest: Make sure interrupt is allocated ok by lguest_setup_irq 2012-01-12 15:44:47 +10:30
macintosh Core device tree changes for Linux v3.4 2012-03-21 10:30:03 -07:00
mca mca: struct device - replace bus_id with dev_name(), dev_set_name() 2009-03-24 16:38:23 -07:00
md dm thin: support read only external snapshot origins 2012-03-28 18:41:28 +01:00
media Merge branch 'kmap_atomic' of git://github.com/congwang/linux 2012-03-21 09:40:26 -07:00
memstick memstick: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:19 +08:00
message SCSI updates for post 3.2 merge window 2012-01-10 10:36:08 -08:00
mfd Things are really quieting down with the regmap API, while we're still 2012-03-22 20:33:14 -07:00
misc Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
mmc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
mtd Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
net Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
nfc NFC: Remove the rf mode parameter from the DEP link up routine 2012-03-06 15:16:23 -05:00
nubus include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
of Core device tree changes for Linux v3.4 2012-03-21 10:30:03 -07:00
oprofile tidy up after d_make_root() conversion 2012-03-20 21:29:37 -04:00
parisc [PARISC] include <linux/prefetch.h> in drivers/parisc/iommu-helpers.h 2012-02-27 09:44:15 -06:00
parport Autogenerated GPG tag for Rusty D1ADB8F1: 15EE 8D6C AB0E 7F0C F999 BFCB D920 0E6C D1AD B8F1 2012-01-14 12:32:16 -08:00
pci Features: 2012-03-22 20:16:14 -07:00
pcmcia Merge 3.3-rc6 into driver-core-next 2012-03-09 12:35:53 -08:00
pinctrl pinctrl: support pinconfig on the U300 2012-03-12 22:49:03 +01:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-22 09:43:22 -07:00
pnp PNP: work around Dell 1536/1546 BIOS MMCONFIG bug that breaks USB 2012-01-06 12:11:20 -08:00
power Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-03-20 21:12:50 -07:00
pps pps: class_create() returns an ERR_PTR, not NULL 2012-03-05 15:49:43 -08:00
ps3 powerpc/ps3: irq: Remove IRQF_DISABLED 2011-11-08 14:51:46 +11:00
ptp phc: Update author's email address. 2012-03-17 01:41:43 -07:00
rapidio rapidio/tsi721: fix bug in register offset definitions 2012-03-15 17:03:03 -07:00
regulator regulator: Updates for 3.4 2012-03-21 10:34:56 -07:00
rtc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-20 10:32:09 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2012-03-22 18:15:32 -07:00
sbus sbus: convert drivers/sbus/char/* to use module_platform_driver() 2011-12-04 10:46:58 -08:00
scsi SCSI updates on 20120319 2012-03-22 12:55:29 -07:00
sfi drivers/sfi: sfi_acpi.c needs sysfs.h 2011-10-31 19:31:57 -04:00
sh sh: clkfwk: bugfix: use clk_reparent() for div6 clocks 2012-01-24 10:44:49 +09:00
sn include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
spi SPI changes for v3.4. 2012-03-21 10:32:00 -07:00
ssb Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-03-20 21:04:47 -07:00
staging Cleanups: rename of flush to invalidate, moving reporting of statistics 2012-03-22 19:52:47 -07:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2012-03-22 12:38:04 -07:00
tc include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
thermal thermal: Rename generate_netlink_event 2012-01-23 03:15:25 -05:00
tty Pinctrl updates for v3.4: 2012-03-22 20:25:50 -07:00
uio Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-01-11 18:50:26 -08:00
usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
uwb Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb 2012-01-09 12:09:47 -08:00
vhost vhost: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
video fbdev updates for 3.4 2012-03-22 20:43:40 -07:00
virt drivers/virt: add ioctl for 32-bit compat on 64-bit to fsl-hv-manager 2011-10-14 02:56:02 -05:00
virtio virtio: balloon: leak / fill balloon across S4 2012-03-01 09:28:41 +10:30
vlynq vlynq: Convert irq functions 2011-03-28 19:33:04 +02:00
w1 DS2781 Maxim Stand-Alone Fuel Gauge battery and w1 slave drivers 2012-03-08 11:15:33 -08:00
watchdog Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-03-21 18:55:10 -07:00
xen Features: 2012-03-22 20:16:14 -07:00
zorro misc latin1 to utf8 conversions 2012-01-02 13:04:55 +01:00
Kconfig telephony: Move to staging 2012-02-08 16:58:04 -08:00
Makefile staging: fix the build breakage cuased by telephony drivers 2012-02-09 09:07:46 -08:00